EP2S130F1020I4 Datasheet, PDF (504/768 Pages) List of Unclassifed Manufacturers – Stratix II Device Handbook, Volume 1

Clocking
TCCS, RSKM, and the sampling window specifications are used for
high-speed source-synchronous differential signals without DPA. When
using DPA, these specifications are exchanged for the simpler single DPA
jitter tolerance specification. For instance, the receiver skew is why each
input with DPA selects a different phase of the clock, thus removing the
requirement for this margin.
Figure 5–19. Differential High-Speed Timing Diagram and Timing Budget for Non-DPA
Timing Diagram
External
Input Clock
Internal
Clock
Time Unit Interval (TUI)
Receiver
Input Data
TCCS
RSKM
Sampling
Window (SW)
TCCS
RSKM
Timing Budget
External
Clock
Internal
Clock
Synchronization
Transmitter
Output Data
TCCS
Receiver
Input Data
t_SW (min)
Bit n
Internal t_SW (max)
Clock
Bit n
Falling Edge
TUI
Clock Placement
RSKM
TSWBEGIN
TSWEND
Sampling
Window
RSKM
TCCS
2
5–20
Stratix II Device Handbook, Volume 2
Altera Corporation
January 2008